I think it has something to do with the hosting environment because clients on one of the two hosting services were fine, including the CDN. The ones hosted at the other service showed images as black and the slider show didn’t work at all. As soon as I put the site back to the older version of WordFence, and upgraded everything else except WordFence, it worked well again.
I love this Plugin and I”m sure this new feature is wonderful. I’ll be happy to send you the hosting service as it is one of the biggest. I’ll need your email address though. Thank you for helping on this.